No seriously,
I have heard on this forum that some hens will crow, maybe no a full blown cockadoodledo, but its some sort of crow none the less.
I don't know the reason for it.
Just a month ago I posted about how I was upset that my favorite pullet crowed so now I knew it was a rooster and I couldn't keep it.
People started saying that sometimes the pullets will do that and not to be too hasty on getting rid of a roo.
If I can find that thread again I will post it.

this was the title of the thread and for some reason i can't bring it up.
Whenever I put it in as search or for author search it brings me to my own personal page with my settings.
Maybe if you try it in the search section the thread will come up for you. I will work on it again too.